Device for convertible chairs



(No Model.)

LOCKING No. 600,902.

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2 Sheets-Sheet 1.

T. W. WASHBURN. DEVICE FOR UONVERTIBLE CHAIRS.

Patented Mar. 22, 1808.

'mmml (No Model.) 2 Sheets-Sht -2.

' T.. W. WASHBUR'N.

LOCKING DEVICE FOR CONVERTIBLE GHAIRS.

No. 600,902. Patented Mar.22,1898.

WwSQSJ jwevd'omilrrn S rains ATENT rrion.

THEODORE W. WVASHBURN, OF BALDWINSVILLE, MASSACHUSETTS, ASSIGNOR TO GILMAN WAITE, OF SAME PLACE.

LOCKING DEVICE FOR CONVERTIBLE CHAIRS.

SPECIFICATION forming part of Letters PatentNo. 600,902, dated March 22, 1898..

Application filed October 1 8, 1 8 9 '7.

To ctZZ whom it may concern:

Be it known that I, THEODORE W. WASH- BURN, of Baldwinsville, in the county of WVorcester and State of Massachusetts, have invented a new and useful Locking Device for Convertible Chairs, of which the following is a specification, reference being had to the accompanying drawings, in which- Figure 1 is a rear elevation of a portion of a chair with my locking device. Fig. 2 is a side elevation of the parts shown in Figjl,

and Fig. 3 a section on line 3 3 of Fig. 2.

My invention is a simple, compact, efficient, and durable mechanism for locking and unlocking the parts of a convertible chair; and it consists in the combination, with a pair of locking-bolts, each sliding through one of the side pieces of the chair-frame, of a pair of curved levers attached, respectively, to the locking-bolts and fulcrumed on a round of the chair-frame, with their inner ends overlapping and extending in reverse directions through a hasp on a rod, which rod extends through the rear of the seat and through the round on which the levers are fulcrumed, the rod being provided with a knob by which it is pulled endwise against the force of a retracting-spring, as will now be explained more fully by reference to the drawings, which show the best form of my invention.

- The chair-frame shown is made up of the seat A, its support a, base-pieces B B, and cross-round a. Two pairs of legs D D are connected by axial pins to the base-pieces B B,

and the legs of each pair are geared together, as shown in Fig. 2. Leg D of each pair is provided with a locking-fiange d,with several bolt-holes (usually four, as shown) to receive one of the bolts 1) 6. These bolts are con- Serial No. 655,559. (No model.)

nected, respectively, to the outer ends of the curved levers F F, and the inner ends of these levers overlap, and these overlapping ends extend through a hasp G, fast to rod 9, as shown in Figs. 1 and 3. The levers F F are fulcrumed on cross-round a, and rod 9 extends through the rear of seat A, spring g, and cross-round a and is provided with knob or handle 9 above seat A, as best shown in Figs. 1 and 3.

When the legs D D are to be readjusted, rod g is moved endwise against the force of spring g, and the action of hasp G on levers F F positively retracts the bolts 17 b and permits the legs to be readjusted and relocked when the proper bolt-holes in locking-flanges 5 5 d come in line with the bolts.

Other locking mechanisms have long been known for such chairs; but mine, contains fewer parts, costs less, is more direct and positive, more durable, and otherwise better than any before known.

What I claim as my invention is- The locking device for convertible chairs made of locking-bolts b b; round a; curved levers F F fulcrumed on round a, connected at their outer ends with the locking-bolts, and overlapping at their inner ends; hasp G crossing the overlapped inner ends of the curved levers; rod 9 fast to hasp G, and extending through the chair-seat A and round a; and spring 9 on rod 9 between seat A and hasp G; all combined substantially as described.

THEODORE W. l/VASHBURN.

Witnesses:

J. F. WINCH, Moses A. WINoH. 

